An antenna is of height 500 m. What will be its range (Radius of the earth is 6400 km)?
The antenna current of an AM transmitter is 8 A when only the carrier is sent, but it increases to 8.93A when the carrier is modul..
The special theory of relativity is based on the frame of reference which has constant...?
The characteristic impedance of a coaxial cable is of the order of
Fainted stars are called
The characteristic impedance (Z0 ) of free space is
Ozone layer blocks the radiations of wavelength
The galaxy in which we live is
What happens inside optical fibre?
What should be minimum length of antenna for efficient transmission of signals of wavelength A ?
Which one of the following is a full duplex transmission system?
What is the minimum length of antenna required to transmit a radio signal of frequency 20 MHz ?
Choose the electromagnetic radiation relevant to telecommunication
What fraction of the surface area of the earth can be covered to establish communication by one geostationary satellite?
The principle of laser action involves
The waves used for Line of Sight (LOS) communication are
In frequency modulated wave,
A single of 5 Khz frequency is amptitude module
If sky wave with a frequency of 50 MHz is incident on D region at an angle of 30 degree , then angle of refraction is
In a video signal for transmission of picture, what value of bandwidth is used in communication system?
The distance of coverage of a transmitting antenna is 12.8 km. Then, the height of the antenna is
(given that radius of the earth ..
If a radio receiver amplifies all the signal frequencies equally well, it is said to have high
How many photons are emitted by a laser source of 5 * 10^-3 W operating at 632.2 nm in 2s ?
Choose the correct statement
In amptitude modulation sinusoidal carrier frequency
A telephonic communication service is working
If Ec= 20 sin 10^5 pie t and Em= 10 sin 400 pie t are carrier and modulating signals respectively, the modulation index is
This questions has statement-1 and statement
A radar has a power of 1 kw and is operating
A diode detector is used to detect an amptitude
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